Code Golf: Git Hub Avatar Generator

build.gradle

apply plugin: 'groovy'
apply plugin: 'application'

mainClassName = 'cash.andrew.GitHubAvatar'

repositories {
    jcenter()
}

dependencies {
    compile 'org.codehaus.groovy:groovy-all:2.4.8'
}

GitHubAvatar.groovy

package cash.andrew

import javax.imageio.ImageIO
import java.awt.image.BufferedImage
import java.time.LocalDateTime

// 0xffffff + 1
// so that random returns a value from 0 to 0xffffff
final int MAX_COLOR_VALUE = 16777216

def random = new Random()

def backgroundColor = 0xf0f0f0
def avatarColor = random.nextInt(MAX_COLOR_VALUE)

// highly unlikely but just to make sure
while (avatarColor == backgroundColor) {
  avatarColor = random.nextInt(MAX_COLOR_VALUE)
}

def image = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB)

// outside 2 columns
for (x in 0..1) {
  for (y in 0..4) {
    def color = random.nextBoolean() ? backgroundColor : avatarColor
    image.setRGB(x, y, color)
    image.setRGB(4 - x, y, color)
  }
}

// center row
for (y in 0..4) {
  def color = random.nextBoolean() ? backgroundColor : avatarColor
  image.setRGB(2, y, color)
}

def fileName = "avatar_${LocalDateTime.now()}.png"
def file = new File(fileName)
ImageIO.write(image, 'png', file)

println "New avatar created! $fileName"